Scientific knowledge is based on evidence. Where do scientists acquire evidence?

The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?

Wind and moving water provide what kind of energy? a. chemical b. mechanical c. thermal d. none of the above

What came about in the devonian period